Channel estimation in a CDMA cellular communication system
AssigneeNokia Mobile Phones Ltd.
InventorsAntti Toskala, Ari Hottinen
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Abstract
A method and circuitry for channel estimation in a cellular communication system is disclosed. Data is transmitted with variable data transmission rates as a plurality of data symbols over a sequence of time slots. Each time slot has at least a proportion containing data symbols, the proportion being dependent on the data transmission rate. An estimate of the transmission rate is determined and is used in channel estimation so that the channel estimation is based on the proportion of received data symbols.
Claims15
A method for channel estimation in a cellular communication system with variable data transmission rates wherein data is transmitted as a plurality of data symbols over a sequence of time slots, each time slot having at least a proportion containing data symbols, said proportion being dependent on the data transmission rate and wherein an estimate of the transmission rate is determined based on said proportion of data symbols and is used in channel estimation so that the channel estimation is based on received data symbols.
Signal receiving circuitry for use in a cellular communication system with variable data transmission rates wherein data is transmitted as a plurality of data symbols over a sequence of time slots, each time slot having at least a proportion containing data symbols, said proportion being dependent on the data transmission rate, the signal receiving circuitry comprising:
- a rate estimation unit for receiving incoming data symbols and determining therefrom an estimate of the transmission rate based on said proportion of data symbols;
- and
- a channel estimation unit which utilises the estimated transmission rate of the received data symbols in channel estimation.
A mobile station including signal receiving circuitry, said signal receiving circuitry comprising:
- a rate estimation unit for receiving incoming data symbols which are transmitted over a sequence of time slots, each time slot having at least a proportion containing data symbols, said proportion being dependent on the data transmission rate, said rate estimation unit being operable to determine an estimate of the transmission rate from the proportion of incoming data symbols;
- and
- a channel estimation unit which utilises the estimated transmission rate of the received data symbols in channel estimation.
A base station including signal receiving circuitry, said signal receiving circuitry comprising:
- a rate estimation unit for receiving incoming data symbols which are transmitted over a sequence of time slots, each time slot having at least a proportion containing data symbols, said proportion being dependent on the data transmission rate, said rate estimation unit being operable to determine an estimate of the transmission rate from the proportion of incoming data symbols;
- and
- a channel estimation unit which utilises the estimated transmission rate of the received data symbols in channel estimation.
A method for channel estimation in a cellular communications system with variable data transmission rates wherein data is transmitted as a plurality of data symbols over a sequence of time slots, and wherein rate information is transmitted with the data, wherein each time slot has at least a proportion containing data symbols, said proportion being dependent on a data transmission rate, and wherein an estimate of the transmission rate is determined based on said proportion of data symbols in each time slot prior to decoding said rate information.
Dependencies are inferred from the claim text.